I have a creature suggestion even though I may not even join this. The suggestion is: Elementals.

Elementals are creatures, mainly humanoid creatures. They can be technically demonic, earthly, and holy, but for this we'll just consider them earthly with a broad range. They are made up from one or two elements. One element would make that element strong, two elements would be a medium-weak version of both elements. They really don't have any specific gender, as they are made up from elements, and they also are weak to whatever element(s) counter its main element(s). Because of it's lack of organs, it has no need to eat, or sleep. They do not reproduce, they are created through a strong force of one element, mixed with a bit of it's creator's intelligence.